Hi there Evgenii,
We do try hard to stick to one issue per topic – so let’s deal with the first issue here and if you need help with the second (CSS-related) item please go ahead and create a fresh topic, one of the team will be only too happy to assist further 🙂
Google Calendar Link in the pages of events does not work … and there is a technical message: “Invalid request” and poor broken robot
Very often this is the result of a plugin or theme conflict. I do see you already tried running through our standard troubleshooting steps – can you confirm the problem persisted even with a default theme and no other plugins running/that no conflicts were flagged up here?
Thanks!